First, you should always try to get a Parasolid model for import if at all possible. Parasolid is built on the same kernel as Onshape, so you are least likely to have errors when importing models in this format. Invalid Geometry Next, you should check the model for anything that would be...
PTC Onshape A PRT file is a part created by PTC Creo Parametric, which is part of the CreoCADsuite. It contains information used to record the part's structure and show it as a 3D model. Creo users often combine PRT files into Creo assembly (.ASM) files. ...